Machine for drawing sheet metal



2 Sheets-Sheet 1.

(No Model.)

B J GOOD MACHINE FOR DRAWING SHEET METAL.

Patented Aug. 4, 1896.

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(No Model.) v

R. J. GOOD.

MACHINE FOR DRAWING SHEET METAL. No. 564,990.

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ATTORNEY UNITED STATES PATENT OFFICE.

ROBERT J. GOODQOF BROOKLYN, NEXV YORK.

MACHINE FOR DRAWING SHEET METAL.

SPECIFICATION forming part of Letters Patent No. 564,990, dated August 4, 1896.

Application filed December 14, 1895. Serial No. 572,154. (No model.)

To all whom it may concern.-

Be it known that I, ROBERT J. GOOD, acitizen of the United States, and a resident of the city of Brooklyn, Kings county, New York, have invented certain new and useful Improvements in Machines for Drawing Sheet Metal, of which the following is a specification.

My invention relates to improvements in machines for drawing sheet metal.

The essence of the invention consists in the combination, with a suitable female die and a reciprocating plunger (or male die) cooperating therewith to draw the metal, of a driver for actuating the plunger, a reciprocating blank-holder for holding the metal sheet in position during drawing, and a driver therefor so cooperating with the driver of the plunger that the blank-holder shall descend upon the blank in order to hold the same in position and shall then dwell, while the plunger shall continueto move past or through the blank-holder, in order to draw the metal, and that, when the drawing is completed, the blank-holder shall rise far enough to permit the article to be removed from the die.

Referring to the drawings which accompany the specification to aid the description, Fig ure 1 is a front, and Fig. 2 a side, elevation. Fig. 3 is a partly broken and sectioned front, and Fig. 4: a similar side, view of the machine, Fig.- 5 being a broken horizontal section taken about midway of the height of the machine.

A A are standards tied below by the skeletonized casting B, to which they are bolted, and above by the arched and skeletonized cap-piece O.

D isthe female die, secured on the casting B.

E is the mainshaft, turning in its bearings in the standards A, and provided with a pulley F and crank G. H is the connecting-rod or pitman for actuating the plungerS. Said crank and pitman constitute the plungerdriver, as will be more fully hereinafter explained.

The U-shaped pieces J are yokes, two in number, and working onthe crank-pin. The lower part of each yoke is shaped to an arc to fit on said crank-pin, and they are held in position by the bolts j. The upper ends of the yokes are formed into cars It, connected by the bolts Z, which bolts form a pivotal connection between said yokes and the rods L. Said rods L are swiveled in sleeves M, being held therein by shoulders or and nuts -n. Lugs 0 of said sleeves M are pivotally connected by pins 1) with posts 13, which are swiveled by the pins 19 on the cranks q of the rock-shafts Q. Said rock-shafts Q, being two in number, are perpendicular to the main shaft E, turn in bearings on the upper part of the standards A, and have arms Q, connected by connecting-rods Q with the crossheads R of the blank-holder R. The arrangernent of the yokes J, swiveled rods L, sleeves M, and their pivoted and swiveled connections as described constitute a universal connection between the crank G and rockshafts Q, whereby the rotation of the main shaft E produces a certain oscillation of the rock-shafts Q, in such a manner that said rock-shafts with the blank-holder R come practically to rest just as the crank G and tinues to move untilthe drawing is completed.

The said rock-shaft Q, arm Q, and connectin g-rods Q constitute the driver of the blankholder R. Said blankholder R consists of a hollow cylindrical block 4', fixed at the bottom of and carried by the cylinder R which is cast, forged, or made in any other suitable manner and with a part of the shell cut away at the top, as at r, to permit of the oscillation of the pitman H. Said blank-holder R reciprocates on guides a on the standards A, and is provided with four vertically-perforated lugs r through which pass with easy fit long screws 7*, positioned by the nuts 0 T The upper ends of said screws are secured to the ends of the aforesaid cross-heads B. and afford means for adjusting the blankholder R.

The plunger mechanism is made up of the plunger proper, S, which is made of any desired shape and constitutes the male die, the block T, and the frame or chair U. A shanks projects from the center of the top of plunger S into theblock T,and has an eye,through which is placed a key t by way of the slot t in the block T and hole t in the shell of the blankholder. Thus the plunger S is connected with the block T. A bolt .9, threaded in the block T, passes with easy fit through a hole in the web 20 of the chair U, and has a worm-gear V on its upper end, engaged by a worm-shaft it, carried by the chair U. Said worm-shaft to projects beyond the shell of chair U and is provided with a head adapted to be engaged by a proper tool. Any upward thrust of the bolt 3 is taken up by the shoulders a on the sides a of the chair U. The plunger S is adjusted by turning the bolt 8 by means of the worm-shaft it.

It will be seen from the drawings that chair U is guided in a right line through the blank-holder R, and that the block T fits freely in the space between the aforesaid sides 10'' of said chair U below the web or partition u. The pitman II is pivotally connected with said chair U by the pin U7, held in holes in the bosses u on the sides of the chair.

The machine is so organized that the vertical plane through the pin n which is to say, the plane of reciprocation of both the blankholder and the plunger, passes through the swiveled pin of the posts 19 but that the main shaft E is inadvance of this plane, the crank G revolving in the direction of the arrow, Fig. 4. This relative position of the crank G and the plane of reciprocation is important, for, taken in connection with the arrangement of the universal connection between the crank G and rock-shafts Q, it insures that, asthe said crank reaches the position indicated by X in Fig. 4c, the blankholder R, having till then moved with the plunger S, and having arrived very nearly hardupon the metal blank Z, shall dwellthat is, come to rest, or practically to rest, the little motion beyond'this point, if there is any, being of no importance-while the plunger S is drawing the metal blank through the die D. After the drawing, the plunger S having retreated from the die D, the blankholder R will be retracted to the position of Fig. 3, so that the article that was formed can be removed from the die.

Now, having described myimprovements, I

declare that What I claim as my invention, and desire to secure by Letters Patent, is

1. In a machine for drawing sheet metal, the combination of a plunger for drawing the metal, a blank-holder adapted to hold the blank during drawing and also to recede therefrom after drawing, a crank for actuating the plunger, a rock-shaft for actuating the blank-holder, arranged substantially at right angles to the plane of the crank for ac tuating the plunger and a universal connection between said crank and said rock-shaft, whereby the blank-holder dwells at a desired limit and'the plunger continues to move to the end of its stroke.

2. In a machine for drawing sheet metal,

the combination of a reciprocating plunger,

for drawing the metal, a crank for actuating the plunger having its axis of rotation in advance of the line of reciprocation of said plunger, a blank-holder adapted to hold the blank during drawing and release it after drawing,a rock-shaft for actuating the blankholder, and a universal connection between said crank and said rock-shaft, whereby the blank-holder dwells at a desired limit and the plunger continues to the end of its stroke.

3. The combination in a machine for drawing sheet metal of a reciprocating plunger, a rotatable driver therefor, a reciprocating blank-holder adapted to hold the blank during drawing andto release it thereafter, an oscillating driver therefor, arranged substantially at right angles to the driver of the plunger, and a universal connection between the plunger-driver and the blank-holder driver, whereby the blank-holder dwells at a desired limit and the plunger-advances to the end of its stroke.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 6th day of December, 1895.

ROBERT J. GOOD. 

